Honestly, at this point I don't think I'll ever get a tattoo, and I'm ok with that. I have thought a lot about what I would want, though. Here are some of the more serious tattoo considerations I've had in recent years.
"Sing Along Forever" - The title of a Bouncing Souls song. I considered getting it across my shoulder blades (look at the cover of Sublime's self-titled album to get an idea of what I meant).
"To Thine Own Self Be True" - Spoken by Polonius to Laertes in Shakespeare's Hamlet. I would have gotten it across my chest, just under the collarbone from shoulder to shoulder. It probably would have been in the same font as the one above, but maybe not. Doesn't really matter since I'll never do it.
"True Believers" - Another Bouncing Souls reference. This one would have been somehow involved music notes or a snippet of sheet music.
Peace Love Unity - This one is a reference to Anti-Flag. Specifically, their lead singer, Justin Sane, who often ends his writings with the phrase. I wouldn't have gotten words, I would have used symbols to represent them. A peace sign for Peace, a heart for Love, and I never figured out one simple symbol to use for Unity.
Buddha - An image of Gautama Buddha. Probably on the back of one of my calves. Out of respect for him and his message, not out of any Buddhist beliefs.
Sanskrit chant - Don't know which chant or why, and never picked a specific spot for it.
various hardcore references - Over the years there have been lyrics in songs by hardcore punk bands, song titles, album titles, band logos, or abstract ideas associated with hardcore that I thought would make a good tattoo. But none of them ever developed enough in my mind to be a real idea, just random thoughts.
Nataraja - A depiction of Shiva as the cosmic dancer. His dance is meant to destroy our universe so Brahma can recreate it. I just thought it would make an awesome tattoo. Probably all across my back, so if I ever went through with plans I would have to find a way to compromise with the Sing Along Forever tattoo. Possibly on an upper arm instead.
Logo battle - This started as a joke with friends but I think I would actually like to see it as a tattoo. Not on me, but on someone. A battle scene with the logos of Google, Facebook, Apple, Microsoft, etc, fighting to the death. Awesome.